Moray Low will miss the start of Scotland's RBS 6 Nations campaign after being ruled out for eight weeks with a medial ligament injury.
Low and Ruaridh Jackson sustained injuries during the first-half of Glasgow Warriors' RaboDirect PRO12 match away to Scarlets on Saturday.
Low, 27, has since been assessed by orthopaedic surgeon Graham Lawson at Spire Murrayfield Hospital, who confirmed that the prop has suffered damage to the medial collateral ligament.
While it is common for this injury to require re-evaluation the expectation is that Low will be absent for at least eight weeks.
Stand-off Jackson, 23, was withdrawn with a leg injury when kicking an early penalty but no long-term issues are anticipated.
Warriors head coach Sean Lineen said: "This is clearly very disappointing news for Moray.
"He's an ambitious player who is extremely keen to achieve success with both Glasgow and Scotland, and the injury has come at a very unfortunate time.
"He's a tough character, however, and I know he'll work hard to bounce back strongly.
"In terms of his rehab, he'll be in great hands with the medical and physio team we have here at the Warriors."
Scotland head coach Andy Robinson said: "We all wish Moray a speedy recovery."